Engine oil cooler

MK

1967 MERCEDES BENZ 250SE

6 CYL

2WD

AUTOMATIC

123,000 MILES

I have a 1967 benz 250se, its leaking coolant from the engine oil cooler. Cant take off the cooler for repairs. Have tried 2 different mechanics. Oil lines wont budge and may damage. They have bypassed the coolant line. Would this damage anything?